Keyframing per particle attributes in Maya?

melviso

I have a scene with instanced particles in Maya and I used expressions to get the particles to rotate randomly and I can control the speed by entering a numeric expression in the runtime after dynamics.
Problem is I want the particles to start rotating at a particular frame.Is there a way I could do this?

I would appreciate any help l can get.Thanks.

melviso

Nobody...??Anyone with experience in dynamics in Maya?